Electric lamp.



No. 730,069, PA'TENTED JUNBZ, 1903. A. J. WURTS,

ELEGTRIC LAMP.

APPLICATION FILED SEPT. 28, 1901.

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PATENTED JUNE 2, 1903.

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ELECTRIC LAMP.

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THE Noams PETERS no. woToumQ. WASHVNGTON, 0v 0- UNITED STATES PatentedJune 2, 1903.

PATENT OFFICE.

ALEXANDER JAY WURTS, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO GEORGEXVESTINGl-IOUSE, OF PITTSBURG, PENNSYLVANIA.

ELECTRIC LAM P.

SPECIFICATION forming part of Letters Patent No. 730,0 69, dated June 2,1903. Application filed September 28, 1901. Serial No. 76,970. (Nomodel.)

To all whom it may concern:

Be it known that LALEXANDEE J AY WURTS, a citizen of the United States,residing in Pitts burg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in ElectricLamps, of which the following is a specification.

My invention relates to electric lamps of the type in which thelight-emitting member or element is a non-conductor under ordinarytemperatures, but becomes a conductor when heated to a relativelyhigh'temperature.

The object of my invention is to provide an automatic cut-out for theheater that is employed to raise the light-giving member to conductingtemperature which shall be noiseless and certain in operation andadapted for use in connection with alternating currents irrespective ofthe rate of alternations.

With these ends in viewI have devised the means shown in theaccompanying drawings, in Whl0l1 Figure 1 is a view, partially in sideelevation and partially in section, of a lamp construeted in accordancewith my invention.

Fig. 2 is a plan view of a portion of the mechanism shown in Fig. 1.Fig. 3 is acombined sectional and diagrammatic view of the operatingparts of the lamp. Figs. 4 and 5 are views of aportion of the cut-outarmature, taken at right angles to each other and partially in sectionand partially in elevation. Figs. 6 and 7 are respectively a frontelevation and a horizontal section of cut-out contacts of modifiedconstruction. Figs. 8 and 9 are views corresponding to Figs. 6 and 7 andillustrating a slight modification. Figs. 10 and 11 are also viewssimilar to Figs. 6 and 7, but showing a slight further modification.

Referring now to the details of construction illustrated in thedrawings, the lamp 1 is shown as comprising a frame 2 for supportingtheoperative parts, a housing 3, and a globe 4, depending from the housing.None of these parts, however, pertain to my inven tion, except in so faras they constitute parts of a complete lamp.

The base-plate 5, of suitable material, on which are mounted thebinding-posts 6 and 7, is provided with suitable means (not shown) fordetachably supporting the glowers, the latter being alsoshown onlydiagrammatically in Fig. 3. Supported above the plate 5 by means of asuitable block or standard 8 is a second plate or disk 9, having hollowsor recesses 10 in its upper surface, one for each ballast resistance,the lower ends of the glass bulbs or tubes 11, in which the ballastwiresare located, being seated in these holes or recesses 10. v

Projecting upward from the center of the plate 9 is a post 12, the upperend of which may project through the top of the housing and have screwedonto it a nut 13, having an eye 14: to be used for suspending the lampand serving to clamp the parts of the housing in position. Securelyfastened to the rod or post 12 is a metal piece 15, (see Figs. 1 and 2,)having a plurality of arms 16, one for each ballast-tube 11, the outerends being perforated, so as to receive the pointed ends of theballast-tubes, and since this plate is so disposed that the arms will besprung into position they will hold the ballast-tubes securely in place.If desired, a small disk of asbestos 17 may be interposed between eacharm and the top of the ballast-tube, so as to avoid any danger of noiseor the breaking of tubes.

The plate 15 is also shown as provided with two arms 18, '(see Fig. 2,)the outer ends of which have holes through which project the insulatingbushings 19, that surround the conductors 20, leading from the source ofcurrent to the operating parts of the lamp.

' The cut-out, which is also mounted upon the plate 9, comprises anactuating-coil 21, (reference being now had to Figs. 1 to 5, inclusive,)on the top of which is clamped a nonconducting-bar 22, having slotsadjacent to 0 its ends, in which are supported bearing pins or trunnions23". These bearing pins or trunnions are fastened in position by bodies23 of cement, and from them are loosely suspended two iron or steel arms23, that serve 5 as armatures for the magnet-coil 21. These arms are ofangular form, as indicated, so that their lower ends will normally swingoutward under the action of gravity. The lower end of the coil is alsoprovided with a mo pole-piece 24, the ends of which project upward andoutward from the bottom of the coil. Adjacent to the pole-pieces 24: arethe stationary contact members of the cut-out, each of which has twosubstantially vertical pins 26, of silver or other suitable metal, inposition to be engaged by a horizontal bar 27, mounted in the lower endof the arm 23. This bar 27 projects through a hole 28 in the end of thearm 23, thatis of materially greater diameter than the bar, and thelatter is loosely supported upon a Vertical pin 30, that projects intothe enlarged central portion 29 of the hole 28. By reason of thisconstruction and arrangement of parts the bar is free to turn laterallyon the pin and may also rock vertically to a greater or less degree.

Since each of the arms 23 is loosely suspended from its upper end, itdoes not necessarily move in exactly the same path each time that it isactuated; but notwithstanding this possible irregularity of movement themeans for supporting the bar 27 is such that it will invariably makegood contact with both of the corresponding pins 26 whenever the magnetis denergized.

In Figs. 6 and 7 the construction is the same as that already described,except that the lower end of the armature 23 is recessed at 31,.and thebar 2'7 is bent around this recessed portion, so as to be looselysupported upon the head 32 and be thus free to turn in any direction, soas to always make engagement with the pins 26. v

In Figs. 8 and 9 the construction is the same as that shown in Figs. 6and 7, except that the bar 27 is bent completely around the recessedportion 31, so as to make a loop or eye. The operation is, however,substantially the same as that already described.

In Figs. 10 and 11 the armature-arm 23 is recessed in the same manner asis illustrated in Figs. 6 to 9; but in this case a loose band or ferrule33 surrounds the recessed portion 31. This loose band or ferrule istherefore free to turn on the recessed part, and it makes engagementdirectly with the stationary contact-terminals 26 which in this instanceare bent laterally, so as to form a V-shaped space, into which the lowerend of the arm 23 moves when the magnet is deenergized. With thisarrangement the ferrule or band is obviously free to turn or roll, sothat it will readily move into engagement with both contacts withoutmaterial friction by reason of the rolling action.

It will be understood that my invention is not limited to cut-outs inwhich the armature bridges two circuit-terminals, since the utilizationof the armature as one of the ciredit-terminals is obviously feasibleand within the scope of the invention.

Other variations as regards form of parts may obviously be made withoutdeparting from my invention, and I therefore desire it to be understoodthat the invention is not limited to the details of construction shown,except in so far as limitations may be imposed by the state of the art.

I claim as my invention- 1. A cut-out for electric-lamp heaterscomprisinga substantially vertical magnet, a nonconducting, slotted barsupported thereby and a circuit making and breaking armature looselysuspended from said slotted bar and provided at its lower end with acontact-piece having a universaljoint connection therewith.

2. A cut-out for electric-lamp heaters comprising a substantiallyvertical magnet, a nonconducting, slotted bar supported thereon,trunnions supported by said bar and circuit making and breakingarmatures loosely suspended from said trunnions and provided at theirlower ends with loosely-supported contact-pieces.

3. A cut-out for electric-lamp heaters comprising a substantiallyvertical magnet,a slotted bar supported thereon, trunnions supported inrecesses in said bar and cemented therein and circuit making andbreaking armatures loosely suspended from said trunnions and provided attheir lower ends with loosely-supported contact-pieces.

4. A cut-out for electric-lamp heaters comprisingasubstantially verticalmagnet, aslotted bar supported thereon, a supporting-plate for themagnet having heater-circuit terminals, armatures loosely suspended fromthe slotted bar and circuit making and breaking pieces loosely supportedupon the lower ends of said armatures in position to engage saidheater-circuit terminals.

5. A cut-out for electric-lamp heaters comprising a magnet, a slottedbar supported thereon, stationary contact-terminals, an angular armatureloosely suspended from said slotted bar and a contact device looselysupported by said armature in position to engagesaid contact-terminalswhen the magnet is denergized and held free from all mechanical contactwhen the magnet is energized.

In testimony whereof I have hereunto subscribed my name this 20th day ofSeptember, 1901.

ALEXANDER JAY l/VURTS.

